Locomotive-boiler.



S. A. REEVR,

LOUOMOTIVE BOILER.

APPLICATION FILED MAE. 2, 190a.

Patented Oct. 26,1909.

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UNITED STATES PATENT OFFICE.

SIDNEY A. REEVE, OF WORCESTER, MASSACHUSETTS, 'ASSIGNOR TO CHARLES F.BROWN, TRUSTEE, 0F READING, MASSACHUSETTS.

LOCOMOTIVE-BOILER.

Specification of Letters Patent.

Patented Oct. 26, 1909.

Application filed March 2, 1906. Serial No. 303,763.

tions through the length of the boiler, such type being illustrated inmy prior patents Nos. 799,265 and 803,788.

The objects of the present invention are to secure an improved draft andan improved control of the several functions of the boiler, such asvaporizing, feed-heating and superheating.

Of'the accompanying drawings,Figure 1 represents a longitudinal sectionof a .locomotive constructed in accordance with my invention, Fig. 2represents a section on the line 22 of Fig. 1; Fig. 3 represents asection on the line 3-3 of Fig. 1; Fig. 4 represents a transversevertical section of the device 31 on the line 4t of Fig. 1.

The same reference characters represent the same parts in all thefigures.

In the drawings 10 is the body of the boiler, 11 is the fire-box at therear end, 12 is the smoke-box'at the forward end, 13 is the usualsmoke-stackleading therefrom, and 14 is the nozzle directed into thesmoke-stack and receiving exhaust steam in the usual manner from thecylinders 15. This boiler contains three sets of tubes, viz: vaporizingtubes 16, superheating tubes 17 and feed -heating tubes 18, thearrangement being substantially the same as shown in my Patent No.803,788 aforesaid. The vaporizing chamber is formed by the lower wall ofthe boiler and two upright longitudinal partitions 19, 19 extending fromend to end, and the group of vaporizing-tubes occupies the lower middleportion of the boiler. The feed-heating tubes 18 are arranged in twogroups alongside of the vaporizing space below the upper edges of thepartitions 19. Feed-water is supplied to the two, preheating spacesthrough pipes 21, 21 (Fig. 2), and, becoming heated in passing upwardlyover the tubes 18,. it overflows into the vaporizing space. Thevaporizing chamber and the preheating chambers have a common steam spacein the upper part of the boiler shell and in this are located thesuperheating tubes 17 All tubes terminate in the front and reartube-sheets, but the rear ends of only the vaporizingtubes 16 emanatefrom the fire-box 11. The rear ends of the feed-heating andsuperheating-tubes 18, 17 open into a rear gas chamber 23 whichstraddles the fire-box 11. In front of the forward tube-sheet is a gaschamber 24 adapted to connect the forward ends of the vaporizing-tubes16 with the forward ends of the superheating-tubes 17 so that gasesissuing from the former may returnthrough the latter to the gas chamber23. Theforward ends of the feed-heating tubes .18 open directly into thesmoke-box 12 alongside of the forward gas chamber 24 as,

in Patent No. 803,788 aforesaid. It will be apparent that if a completecircuit of the gases is allowed they will pass from the firebox 11forward through the vaporizingtubes 16 into the gas chamber 2a, thenrear-.-.

wardly through the superheating tubes 17 into the rear gas chamber 23and then forwardly through the feed-heating tubes 18 into the smoke-box12 and thence out of the stack 13. 25, 26, 27 are cinder pockets in thebottoms of the smoke-box 12 and gas chambers 24, 23.

i For the purpose of increasing the draft, I have added a smoke-stack 28which leads to the atmosphere from the rear gas chamber rated by apartition 34 over the upper edge A doubleof which they communicate.

faced oscillating valve 35 operated by a handle 36 in the cab is adaptedto shut off either nozzle 14 or 29 when in either of its extremepositions, or to stand in an intermediate position filling up theopening in the partition 35. Thus any relative strength :of blast may beobtained in the two stacks;

-nate blasts in'the-two stacks and each blast,

is stronger than if both nozzles received the exhaust of both cylinders.

In the front wall 37 of the forward g'as chamber 24 is an openingcontrolled by a.

pivoted "damper 38 whichis'actuated by a 'p handle 39 in thecab,'whereby=more or less of the gases issuing from the vaporizingtubes16 may pass-directlyout'of the forward stack '13. Or, if-the'partition37 be omitted-altogether, all of'the' gases'dra-wn -rearward-by thestack28 will have-both sets oftubes, 17 and 18, as their pathway.

'- In the operation ofthis apparatus,when- "ever the n'ozzle'29 of therear stack is in operation some of the gases entering the forward gaschamber 24 will be drawn back through'the superheating tubes 17 and dis-1 charged out of the stack 28, whether or not the damper 38 is open.WVhen saiddamper is closed all of'the gases take this path; andwhen-both stacks are in operation, some of the'gases will return forwardthrough the preheating-tubes '18, thus making athird passage of-the'boiler as indicated by the forwardly-directeddotted arrows in Fig. 1. If'only"theforward stack 13 is in operation and the damper-38 closed, all'of the gases will pass three timesthe 'lengthof the boiler. The draft issomewhat restricted in this case if the preheating surface '18 isrelatively small in area,but such operation givesmaximum efliciencyi Ifonly the forwardstack,-' as in any locomotive.

manner of -operat1ongives the maximum ward stack '13 isi-n operation andthe damper 38- is open,*the gases will'pass only through thevaporizing-tubes 16 direct 'to thefor- This freedom' of draft and may beemployed when the boiler is -forced, as in climbing grades.

1 If both 'stacks'be in operation and the damperbe"suificiently wideopen, or if the partiti'on37 'be entirely absent, the flow of gases willberearward in both sets of tubes,

"17 and '18,-in paral-lel, giving a freer draft or permitting a smallerboiler-diameter for a given amount of superheating and feedhea'ting butthe efliciency of this plan is notso' good as when the gases traversethe superheater-tubeS before entering the feed heating tubes. By usingthe superheatingl tubes 17the water-level may be carried very highwithout wet steam and thus the period of time'during which steam may bemade without feeding is increased. My improved "arrangement of stacksand damper results in a better draft for this kind ofboiler and a andrelative quantities of heat apportioned to the several sets of tubes.

What I claim as new and desire to secure by Letters Patent is:

1. A locomotive-type boiler having watervaporizing, steam-superheating,and waterpreheating surfaces, heating fiues adapted'to conduct the gasesover said surfaces succes- 'sively" in the order named and in forwardand return directions, a stack at the rear part of the boiler adapted todischarge a ortion of said gases before they have completed theentirepassage of said heatingsurfaces, and a second stack 'a't-th'eforward part of the boiler adapted to discharge-gases which havecompleted theentire passage.

' 2. A locomotive boiler comprising a boiler barrel having a furnaceattherear-end,'vaporizing and preheating chambers withinsaid barrel atthesame level,'flues traversing-said chambers,-means forming agas-passage connecting the forward ends of said fiues, and a stack atthe rearend ofMthe 'pre-heating flues for discharging gases whichhavetraversed'the twosets-offiues. 3; A locomotive-type boilercomprising a boiler barrel containing vaporizing and-pie heatingchambers alongside 1 each other and having a furnace at the-rear end,superheating surfaces for the steam, passages for con ducting the gases=first through'the vaporizing-chamber and then across thesuperheating-surfaces 1 and through thepreheating-chamberyand a singlestack at the-rear part of the boiler adapted to dischargethe gasesafter'such transit.

4. A locomotive-type boiler having vaporizing, superheating, andpreheating surfaces,

'fiues for conducting the furnace gasesover sald surfaces in forwardand-returndire'ctions, a'gas-chamber at the'rear ofthe boiler connectingthe superheating' and preheating passages and having a gas-dischargestack, a second gas-chamber at'=the' front of the boiler connecting thevaporizing and-super.

heating passages, and a third-gas-chamber at the front of theboiler'having a stack for discharging the gases fromthe-preheatingpassage.

5. A locomotive-type boiler comprising a firebox at the rear end, asmoke-box at the forward end, having a smoke-stack, longitudinalvaporizing, superheating and preheating tubes receiving the gases in theorder 7 perfect control over the distribution of draft 6. Alocomotive-type boiler having flues arranged for the passage of gases inopposite directions, a plurality of stacks for discharging said gases, aplurality of engine cylinders, exhaust pipes leading from saidcylinders, exhaust nozzles directed into the said stacks, and an exhaustvalve controllable from the cab and adapted to close either nozzle orconnect the respective exhaust pipes with the respective nozzles.

7. A boiler containing vaporizing, superheating and feed-heatingsurfaces, a stack drawing over the vaporizing surface, a second stackdrawin over the superheating and feed-heating sur aces, and means forvarying the relative draft of said stacks.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses, the 26th day of February 1906.

SIDNEY A. REEVE.

Witnesses:

HENRY L. PARKER, HENRY L. PARKER, Jr.

